Hello, am rather new to handguns. Just purchased a Ruger SR45 and am really enjoying the shooting experience! However, I read on Buffalo Bore's website that when running their ammo, it might be a good idea to get a heavier recoil spring. How heavy should I go? and is it a good idea to keep the factory spring for plinking loads? I also cast, and eventually want to try pushing a 230 Grain cast up close to 900-1000fps, so I assume I will need the heavier spring for that as well.